Insulating-varnish.



Warren snares Parana oust-on.-

CARL BAEDER, OF HOBOKEN, NEW JERSEY.

msULATIfue-vAnmsH.

No Drawing.

To all wr/mm it in (17 concern Be it known that I, Came Banana, a citizen of the Uni ted States of America, and a resident of Hoboken, Hudson county, State of New Jersey, have invented a certain new and useful Improvement in Insulating-Varnishes, of which the following is a specification.

This invention relates to insulating varnishes adapted for a variety of uses such as in connection with electrical Work as an insulating covering or film and analogous uses; for use as an electrical insulator on the surface of Wood, impregnated wood, fiber, fiber compositions, press board,pressed paper, asbestos, asbestos board, etc., and for preventing the absorption of moisture; upon the surface of metal objects where high insulating properties are desired; upon glass and porcelain. for preventing surface leakage and moisture condensation. It finds special application in coating the ordinary fabric insulated electric conductors as well as the bare Wires themselves and in coating poles or other supports for electric conductors. Owing to its flexible nature, when applied to Wires the latter may be bent as desired Without breaking or cracking the insulating material.

In the following I have described one way of practising my invention, the features thereof being more particularly pointed out hereinafter in the claims.

Broadly speaking my new insulating varnish comprises a prepared mixture of a suitable gummy substance, such as black asphaltum for example, sulfur, prepared oil in which rubber has been incorporated, thinners and a Japandrier. These various ingredients may be of various kinds and variously prepared and I shall set forth those ingredients and the method of preparing them which I have found by practice to be suitable for the purpose and capable of giving a good result. The gummy substance may comprise any suitable substance having a gummy, resinous or asphaltic base such as resin, Zanzibar resin, kauri (from Austra: lia), Brazilian resin, hard resin, Egyptian black (an as haltum'), black asphaltumf. and gilsonite, (a lack gum having an asphaltum base). I prefer to use gilsonite or black asphaltum.

A suitable prepared oil may be made as follows: take 100 gallons of raw linseed oil;

' 25 pounds of any suitable rubber, preferably Specification of Letters Patent.

Application filed April 18, 1914. Serial No. 832,762.

thereto in such manner that it does not settle to the bottom of the kettle and burn. The.

boiling should be continued until all the rubber has been dissolved. The tempera ture of the liquid mass should then be raised to approximately 560 F. and-held that point, say within 10 either way, for a con siderable length of time. I have found a period of 8 hours to give good results. The liquid mass should then be cooled to approximately 350 F. and the sugar of lead gradually added under stirring, the stirring being continued for a short tune after the sugar of lead has been dissolved; the temperature of the mass should then be raised to approximately 450 F. and the borate of manganese added under stirring; after the borate of manganese has been dissolved or thoroughlyincorporated with the mass the temperature should be raised to approximately 530 F. and held there for a con siderable length of time. I have found 4% hours'to give good results. This last mentioned prolonged heating is to afford opportunity for a thorough mixing of all the ingradients. The liquid mass should noW be allowed to cool to approximately 350 F. and the turpentine added under stirring until it is thoroughly mixed with the liquid mass. r. The prepared oil is now readyfor use. As thinners I may use turpentine or turpentine substitutes, benzene or kerosene. I prefer to --use turpentine. J

- A suitable Japan drier may be made as follows: take 12 pounds of soda ash; 150 pounds of rosin; 10, gallons of raw linseed oil; 25 pounds of sugar of lead; 25 pounds of'black manganese, and 60 gallons of thinners. The soda ash should be dissolved in 4 gallons of Water (three pounds of. soda ash to one gallon of Water) and the liquid heated gently under stirring until the Water has evaporated; the soda ash should then 'be-pulverized and the rosin added thereto;

the mass should then be heated until thoroughly melted and should be stirred until the soda ash is all dissolve the raw linseed fi e should then be gradually added and then the black manganese and the whole mass cooked .until a still pasty mass results; the mass take, for example, 100 pounds of gilsonite; pounds of sulfurg-" i gallons of prepared oil; gallons of'thinners'and 21} gallons of Japan'driei j, The gilsonite placed in/a suitable vessel and heated lac approximately 300 Rand until it is thoroughly liquefied;

"the sulfur is then gradually added under stirring until the sulfur is thoroughly mixed with and dissolved in the liquetied resin, the

temperature meanwhile having been gradu ally raised to vapprg m'mately 350 F. The

prepared oil is alien. added and the tent perature is raise to' approximately 450 F.

I andh'eld at that temperature for some time, s ay. forhalfan hour, the mixture being qineanwhile subjected to stirring; the mixture thenpermitted. to cool to approximately 350-400 F. and the thinners then added and. the mass stirred until. thoroughly mixed, theilnixture meanwhile being 'per-' mitted-to cool to approximately 250 F.; the Japan drie'i'sare-then added under stirrin and the varnishis ready for use.

The varnish is in the form of a father thin liquid varnish. If too thick for use when applied it may be thinned by adding a little turpentine. It is obvious that the order of steps in making my varnish and of adding the. ingredients to each other, such as adding the sulfur to the prepared oil rather than directly to the liquefied resinous material, may be varied without departing from the spirit x. of ny invention. It is further obvious from foregoing,' description that thei'ngredi e its, the proportions thereof antLthe method of preparing my new varnish, may be greatly varied without departing from the spirit or essentials of my inventiomand I do not restrict'myself to any of the details described," further than the scope of the appended claims demand. it What I claim and desire to secureby Letters. Patent is ,1" composition of matter containing; a resinous base. linseed o l, rubber, sulfur,

tivity, a high degree of flexibility and an exceedingly low degree of brittleness.

"3. The composition of matter containing a resinous base, linseed oil, rubber, sulfur and an oxygen compound of manganese, combined with a drier to yield on drying a -1esiduum possessing low electrical conductivity, a high degree of flexibility and an.

exceedingly low degree of brittleness.

d. The composition of matter containing 'gilsonite, linseed oil, rubber, borate of manganese, sugar of lead and sulfur mixed with tlnnnin and drvin media to )roduce u Jon I b 1 y I a drying a resldulun possessing low electrical conductivity, a high degree of flexibility and an exceedingly low degree of brittleness.

5. An insulating varnish comprising a. resinous base and sulfur mixed with the following ingredients in approximately the proportions named; 100 gallons raw linseed oil; 2:: pounds of refined Para rubber; 10 pounds of borate of manganese; 75 pounds of calcined sugar of lead and 50 gallons of turpentine, a thinner and a Japan drier.

6. An insulating varnish comprising the following ingredients in approximately the proportions named; 100 pounds of a resinous base; 10 pounds of borate of manganese; 5 pounds of sulfur; 5 gallons of linseed oil combined-with rubber; 25' gallons of thinners and gallons of a Japan drier.

7. An insulating varnish yielding a residuum possessing low electrical conductiv; ity, a high degree of flexibility, an exceedingly low degree of brittleness composed of a resinous bas e, sulfur, linseed oil, rubber,- oorate of manganese and sugar of lead mixed with thinning and drying media.

In testimony whereof I have signed this specification in the presence 'of two subscribing witnesses.

oAaL BAEDER. vl lfitnessesi 'K. vGr. LE} Am), S. Banner. 

